Solenoid for driving adding-machines.



.F. c'. RlNscHE. SOLENOID FOR DRIVING ADDING MACHINES.

APPLICATION FILED DCT-2.1913.

Patented May 22, 1917.

2 SHEETS-SHEET l.

/%////////////////////lll/M F. c. mNscHE. n SOLENOID FOR DRIVING ADDINGMACHINES.

APPLICATION FILED OCT. 2. 1913.

A Patented May 22, 1917.

2 SHEETS-SHEET 2.

Z2 ZJ UNITED sTATEs PATENT oEEicE.

FRANK C. RINSCHE, OF DETROIT, MICHIGAN, ASSIGNOR TO BURROUGHS ADDING.MACHINE COMPANY, lOIE DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

SOLENOID FOR DRIVING ADDING-MACHINES.

Specification of Letters Patent. Paignted May 22, 1917,

Application filed October 2, 1913. Serial No. 792,941.

T all whom t may conce/Mi Be it known that I, FRANK C. RiNsoHE, acitizen of the United States, residing at Detroit, county of Wayne, andState of Michigan, have invented certain new and useful Improvements inSolenoids for Driving Adding-Machines, of which the following is aspecification.

The object of my invention is to produce a solenoid which isparticularly well adapted for use in connection with an adding machinealthough it is also useful in other connections in which similarcharacteristics are desired. In an adding machine it is desirable thatthe driving mechanism operate quickly and with sufficient power for thepurpose of fully operating all of the parts of the machine and at thesame time the force of the motor should vention, but it is to beunderstood that the specific disclosure is for the purpose of eX-emplication only, and that the scope of the invention is set forth inthe following claims.

In the-drawing Figure 1 is a central section partly in elevation of thepreferred form of my invention; Fig. 2 an end elevation thereof; andFig. 3 a side elevation partly in section'showing the application of theinvention to an 4adding machine. The solenoid comprises a coil 11 ofsuitable character wound upon a hollow spool -or sleeve 12 and supportedat its ends by insulating end disks 13, 13. As shown in Fig. 1 theleft-hand insulating disk is protected by a cap piece 14 and the wholecoil construction is braced by a frame comprising a pair of end plates.15, 16 of magnetic material which are connected by hollow tubular posts17 tapped into the same on diametrically opposite sides of the coil. The

plate 16 is formed with an ear 18 for connecting it to the frame of themachine and thereby supporting one end of the solenoid; the other end 0fthe solenoid is supported by a separate bracket plate 19 which is boltedthrough plate 15 to the 'insulating disk upon the magnet coil by bolts2o, 2o. bracket plate for the purpose of securing it to the base of themachine, it being understood that insulation 22, 23, is interposedbetween the lugs 2 1 and 18 and the machine and any suitable securingmeans insulated from the lugs such as screws employed for attaching thedevice to the machine base. The plate 13 and the bracket plate 19 arecut away or bolted concentric with the spool of the solenoid coil, theopening in the former being of the same diameter as the bore of thespool but that in the latter being slightly larger for a purpose whichwill appear, and through these openings and the end of the spool isinserted a rela- Lugs 21, 21 are formed upon thetively stationary core24 which forms a.

-portion of the magnetic field of the solenoid. The movable core 25 issupported upon a cross-head 26 connecting a pair of guide rods 27, 27,extending into the tubular posts 17 and movable longitudinally therein,antifriction rollers 28, 28, being suitably mounted in the rods 27 tofacilitate easy movement in the tubular guides. The inner end 29 of themovable solenoid core is tapered back a considerable distance from itspoint and the stationary core 24 is correspondingly bored out at 30 toreceive the same, but a washer 31 of leather or similar resilientmaterial mounted on a shoulder ing into actual close contact in orderthat there may be no sticking. The stationary core 24 is loosely mountedin the solenoid vso as to be capable of axial movement therein, and itsinward motion to wit, that toward the reciprocating core is limited byan adjustable nut 32 screwed thereon by which the stroke of thereciprocating core can be adjusted, and a washer 33 which serves tocushion the blow of said nut upon the plate 15. A lock nut 34 preventsthe stop nut becoming unscrewed.

The plate 15 and bracket plate 19 are perof a projection 36 upon theinsulating disk A,

13 whichprojection serves to insulate the terminals of the solenoid coilwhich extend therethrough, andsaid bracket plate is also' provided Withopenings 37, 37 in registry with the tubular guides 17 to avoid aircushioning ef the rods 27 therein. It will be understood that thestationary and movable vcores as Well as the cross-head .26, guide rods27, tubular guides 17 and plate 15 are of magnetic material as iron orsteel sothat there is substantially a closed magnetic circuit at alltimes except for the gap between the tapered end of the movable core andthe socket of the stationary core. Of course this gap is substantiallyclosed when the movable core is in its innermost position and by reasonof the long taper the gap is quite limited at all .times thus securing acomparative even strong pull throughout the stroke even though theconstruction is such as to permit a very considerable movement of themovable core which I have found to be of decided advantage in thepresent structure. It Will be apparent that When the coil ,is energizedand the core 25 attracted it will in common With solenoid cores of theprior art acquire a fair degree .of velocity, but by reason of the factthat the relatively stationary core is free to move under the impact ofthe reciprocating core and the Washer 31 cushions the blow, the noiseand shock of the operation is reduced to a minimum. The Washer 33deadens any noise which would be occasionedby the return of therelatively stationary ogre to its normal position after it has beendisplaced by the impact of the movable core.

The solenoid is secured beneath the base of the machine in horizontalposition andA the,movable core 25 is provided with a bifurcated lug 38between the members of which is pivoted a rack 39 movable horizontallyand meshing With a rack sector 40 rigidly mounted upon the usualoperating shaft 100 of the machine'whereby the solenoid effects theoscillation of said shaft. Rack 39 is supported in contact with the racksegment by an anti-friction` roller 41 mounted upon a bracket 42depending from the machine base. Obviously whenever the solenoid coil isenergized by the passage of a current it attracts its core, therebyoperating the rack attached thereto and through it. and the rack sector27 the main shaft 100 'of the machine and when the coil is disengagedthe shaft and associated parts are relned to their original position byspring By the-particular construction of solenoid having the longtapered movable core and corresponding stationary core and otherfeatures referred to above, I am enabled to obtain a long stroke of evenpull throughout which is essential to the 'successful operation of anadding machine with a minimum of noise and shock.

I claimz.

1. A solenoid comprising a coil, a movable core projecting into the saidcoil, a crosshead on said core, a pair of guide rods on opposite sidesof the coil connected to said cross-head and tubular guides connected tothe coil and receiving said rods. y'

2. A solenoid comprising a coil, a movable core extending through oneend thereof, a cross-head on the core, a pair ofguide rods connected tothe cross-head on opposite sides of the coil and a pair of tubularguides connected to the coil on opposite sides thereof, and adapted toreceive said rods.

3. A solenoid comprising a coil, plates 15, 16 arranged atopposite endsof said coil, tubular guides 17-17 extending between and connected tosaid plates, guide rods 27 entering said guides, and a cross-head 2Gconected to said movable core and guide ro s.

FRANK C. RINSCHE.

i Witnesses:

R. W. FAIRGHILD, R. S. MIELERT.

